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Carbon Tool Steel

End applications

agricultural machine parts, circular saws, materials for cold-rolled steel strip, clutch plates, automobile parts, clip springs, washers, coil springs, band saws, hacksaws, handsaws, blades, clutches, diaphragm springs, horns, latch needles,cutlery,

Usage example

Pressed Goods :SK5 (AY)

Pressed Goods :SK5 (AY)

Chemical Composition

JIS SAE Nisshin Standard Chemical Composition(%)
C Si Mn P S
SK120(SK2)     1.15~1.25 0.10~0.35 0.10~0.50 0.030
max
0.030
max
SK105(SK3)     1.00~1.10 0.10~0.35 0.10~0.50 0.030
max
0.030
max
  SAE1095   0.90~1.03 0.15~0.30 0.30~0.50 0.030
max
0.050
max
SK95(SK4)     0.90~1.00 0.10~0.35 0.10~0.50 0.030
max
0.030
max
  SAE1086   0.80~0.93 0.15~0.30 0.30~0.50 0.030
max
0.050
max
SK85(SK5)     0.80~0.90 0.10~0.35 0.10~0.50 0.030
max
0.030
max
    NK5D 0.80~0.90 0.15
max
0.30~0.50 0.030
max
0.030
max
  SAE1078   0.72~0.85 0.15~0.30 0.30~0.60 0.030
max
0.050
max
SK75(SK6)     0.70~0.80 0.10~0.35 0.10~0.50 0.030
max
0.030
max
    NK6D 0.70~0.80 0.15
max
0.30~0.50 0.030
max
0.030
max
    NCL2 0.65~0.73 0.35
max
0.50
max
0.030
max
0.030
max
SK65(SK7)     0.60~0.70 0.10~0.35 0.10~0.50 0.030
max
0.030
max
    NK7D 0.60~0.70 0.15
max
0.30~0.50 0.030
max
0.030
max

Mechanical properties(hot rolled)

  Type of steel Hot-rolled
hardness
(HRC)
Annealed
hardness
(HRB)
Hardening Tempering
Water quenched
3.15mm max
Oil quenched
below3.15mm
Temperature
(℃)
Hardness(HRC)
Temperature
(℃)
Hardness
(HRC)
Tenperature
(℃)
Hardness
(HRC)
Water
quenched
Oil
quenched
JIS SK120
(SK2)
46
max
98
max
760~820 63
min
770~830 60
min
150~200
air cooled
63
min
60
min
SK105
(SK3
)
45
max
98
max
760~820 63
min
770~830 60
min
150~200
air cooled
63
min
60
min
SK95
(SK4)
44
max
97
max
760~820 62
min
770~830 60
min
150~200
air cooled
61
min
59
min
SK85
(SK5)
43
max
97
max
760~820 62
min
770~830 60
min
150~200
air cooled
59
min
59
min
SK75
(SK6
)
40
max
96
max
760~820 62
min
780~840 60
min
150~200
air cooled
56
min
56
min
SK65
(SK7)
32
max
96
max
760~820 59
min
780~840 57
min
150~200
air cooled
54
min
54
min
SAE SAE1078 43
max
96
max
760~820 62
min
780~840 60
min
150~200
air cooled
59
min
59
min
SAE1086 44
max
97
max
760~820 62
min
770~830 60
min
150~200
air cooled
59
min
59
min
SAE1095 45
max
98
max
760~820 62
min
770~830 60
min
150~200
air cooled
61
min
59
min
Nisshin
Standard
NCL2 33
max
94
max
760~820 59
min
790~850 57
min
150~200
air cooled
55
min
55
min
NK5D 43
max
97
max
760~820 62
min
790~850 60
min
150~200
air cooled
59
min
59
min
NK6D 40
max
96
max
760~820 62
min
790~850 60
min
150~200
air cooled
56
min
56
min
NK7D 32
max
96
max
760~820 59
min
790~850 57
min
150~200
air cooled
54
min
54
min

Thickness range:
Water quenched:NCL2≧3.15mm、NK5D≧2.4mm、NK6D≧2.7mm、NK7D≧2.9mm
Oil quenched:NCL2<3.15mm、NK5D<2.4mm、NK6D<2.7mm、NK7D<2.9mm


Mechanical properties(cold rolled)

Type of steel Annealing Hardness Deep-Drawing Hardness
Standard Special
HV HV HV
J
I
S

SK120 (SK2) ≦220 ≦200 -
SK105 (SK3) ≦210 ≦190 240~280
SK95 (SK4) ≦200 ≦180 200~280
SK85 (SK5) ≦180 ≦170 200~280
SK75 (SK6) ≦180 ≦170 180~280
SK65 (SK7) ≦180 ≦160 180~260
S
A
E

SAE1078 ≦180 ≦170 200~280
SAE1086 ≦180 ≦170 220~280
SAE1095 ≦220 ≦190 220~280

For more information on Nisshin Steel materials, click the link below.
Click here for hot rolled catalog
Click here for cold rolled catalog

Notice

These material information in this page is based on Nisshin Steel Co.,Ltd. product catalog.

There are some cases maker do not accept the production depending on the production lot and specification.

Technical information in this website,while every reasonable effort was made to ensure the accuracy at the time of this publication, is general information relating to our products only and is not meant as any warranty,expressed or implied.
Such technical information does not guarantee that any of our products are suitable for your particular application or purpose. Use of any information contained in this website shall be at user's risk. Any information in this website is subject to change without prior notice. Please contact our company for up-dated information.

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